Wendy is investigating differences in cardiovascular health between children who are involved in extra-curricular activities and those who are not. She decides to investigate only children who are average height and weight, with no existing heart conditions and no family history of obesity. Wendy has employed which method for controlling the extraneous variable in her study?
A) Matching
B) Comparing homogeneous subgroups
C) Analysis of covariance (ANCOVA)
D) Manipulation of independent variable

Question

Quizplus · Accepted Answer

Wendy is using the method of comparing homogeneous subgroups by selecting children who share similar characteristics (average height and weight, no existing heart conditions, and no family history of obesity) to control for extraneous variables. This ensures that the groups being compared are as similar as possible except for the variable of interest (involvement in extra-curricular activities).

Wendy Is Investigating Differences in Cardiovascular Health Between Children Who